On my 2005 Jaguar S-Type 4.2,I'm getting a distinct vibration starting at 50 mph and ending at 59 mph. Prior to 50 mph it runs fine. At 60 mph and beyond it smooths out and runs fine. Any idea of what's causing the vibration and how to eliminate it?
[Years ago, when radial tires first came out, I recall that they were often blamed for vibrations at certain speeds. My tires are relatively new with good tread.]
